Organic fouling and floc transport in capillaries

Arkhangelsky, Elizabeth; Lerch, André; Uhl, Wolfgang; Gitis, Vitaly

doi:10.1016/j.seppur.2011.06.001

Cited by 10 publications

(1 citation statement)

References 29 publications

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“…The higher magnitude ZP that results for CF-IN (27W) is thought to lead to the development of small-sized flocs of low fractal dimension (i.e., loose in nature) [91]. It has been shown by others using the multi-channel h-PES membrane [92,93] that small flocs will deposit more or less homogenously along a greater length of the capillary wall compared to large flocs, which are deposited principally at the capillary dead-end. Therefore, a greater proportion of the fiber capillary is coated by a flocculated suspension which is highly susceptible to compression-this likely explains the rapid TMP increase that occurred following the daily CEB (Figure 4a).…”

Section: Cf-in Seasonality Assessmentmentioning

confidence: 91%

Reduced Low–Pressure Membrane Fouling by Inline Coagulation Pretreatment for a Colored River Water

Ladouceur

Narbaitz

2022

Membranes

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Drinking water treatment (DWT) using low–pressure membranes (LPM) has become increasingly popular due to their many reported advantages compared to conventional technologies. Productivity decline due to fouling has prevented LPMs from becoming the technology of choice in DWT, however, coagulation pretreatment either with or without particle separation mitigates fouling phenomena. The effectiveness of coagulation/flocculation/sedimentation (CF–S), coagulation/flocculation/dissolved air flotation (CF–DAF), and inline coagulation (CF–IN) as technologies for pretreatment of feed water has rarely been investigated using the same water source. In this study, CF–S, CF–DAF, and CF–IN are directly compared as pretreatment of a tubular multi–channeled ultrafiltration (UF) membrane using the same highly colored river water. Three–day long filtration tests were performed using an automated bench–scale filtration apparatus with an inside–out configuration. Although CF–DAF had the greatest removal of dissolved organic matter (DOM) and hydrophobic organics, CF–S pretreatment resulted in a similar level of total fouling. Compared to CF–DAF and CF–S, CF–IN pretreatment resulted in lower fouling. The hydraulic and chemical reversibility of CF–IN fouling was seen to be strongly influenced by the feed water zeta potential, suggesting the importance of floc electrostatic and morphological characteristics on inline coagulation performance.

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Section: Cf-in Seasonality Assessmentmentioning

confidence: 91%

Reduced Low–Pressure Membrane Fouling by Inline Coagulation Pretreatment for a Colored River Water

Ladouceur

Narbaitz

2022

Membranes

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Fundamentals of Membrane Separation

2016

Ceramic Membranes: New Opportunities and Practical Applications

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The fate and importance of organics in drinking water treatment: a review

Ivančev-Tumbas

2014

Environ Sci Pollut Res

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In the pioneer days, the main driving forces for research of organics in drinking water treatment (DWT) were human health risks and optimisation of technology. The focus was on natural organic matter (NOM) structure, disinfection by-products (DBPs) formation, NOM removal by means of coagulation, adsorption, and oxidation, and development of the most efficient water treatment trains. Surprisingly, after decades of research, rapid development of analytical techniques and progress in risk assessment, the same driving forces are still in the limelight - although the topics have changed slightly. The attention switched from trihalomethanes to a new generation of DBPs. The definition of hydrophilic/hydrophobic NOM depends on the technique used for characterisation. It has become evident that numerous organic compounds can threaten water supply sources. Some of them had been ignored or overlooked in the past, but have recently been detected by advanced analytical tools even in drinking water. Prioritisation becomes priority per se. As far as processes are concerned, mainstream research has been following three lines: fouling mechanisms, application of hybrid processes and interactions between synthetic organic chemicals, other water constituents and materials used in DWT. Significant development has been made in membrane technology. This paper presents a broad overview of the recent organics research. Although the state-of-the-art technologies seem to have an answer to each and every question raised, it is still necessary to deal with specific problems on a case-by-case basis mainly due to the unique nature of NOM and different xenobiotics that may appear in various types of waters. In the end, human health risk, which derives from the presence/absence of organics, is only the tip of the iceberg - underneath lies a whole new universe - the socio-economic aspect of water treatment and quality that deserves much more attention.

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Organic fouling and floc transport in capillaries

Cited by 10 publications

References 29 publications

Reduced Low–Pressure Membrane Fouling by Inline Coagulation Pretreatment for a Colored River Water

Reduced Low–Pressure Membrane Fouling by Inline Coagulation Pretreatment for a Colored River Water

Fundamentals of Membrane Separation

The fate and importance of organics in drinking water treatment: a review

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